HP 12000 HP StorageWorks 12000 Gateway Virtual Library System User Guide (AH81 - Page 219

A Troubleshooting This appendix describes some common issues you may encounter while configuring or using the VLS including automigration/replication and deduplication issues. VLS Common Issues Symptom Possible causes Solution Some of the virtual devices are not detected by the operating system when it scans the SAN for new hardware. There are more LUNs on the FC host ports than the operating system is configured to see. Once the maximum number of LUNs on a device is detected, the operating system stops looking for more LUNs. In the case of the VLS, the operating system considers each FC host port to be one device. So, if the maximum number of LUNs an operating system is configured to see is eight, the operating system will only see LUN0, LUN1, ..., LUN7 and will not see LUN8, LUN9, ..., and up on each FC host port. By default Windows and HPUX hosts can see a maximum of 8 LUNs per FC host port. Increase the maximum number of LUNs per device the operating system is configured to see. To change the maximum LUN per device setting: • For Microsoft Windows-See http://support.microsoft.com/ default.aspx?scid=kb%3benus%3b310072. • For HP-UX-The value can only be changed for HP-UX versions 11.31 and later. Increase the number of LUNs per bus on the HP-UX server by entering # scsimgr set_attr -a max_lunid=32. You can view the connected IO by entering # ioscan -m lun. You cannot create legacy DSFs for LUN IDs above 7; use persistent device special files instead. See the HP-UX documentation for more information. • For other operating systems-See the operating system web site. HP StorageWorks 12000 Gateway Virtual Library System User Guide 219